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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
2
REVIEW
3
PASS
10
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
29
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

3.02 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

7.35 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

816 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.541

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

3.21 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

8.77 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
10 PASS 3 REVIEW 2 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (985.1 KiB of 985.5 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3422ms total JS execution
FIX
3422ms total JS execution
Warning::
https://www.icann.org/chunk-ROIY53Y6.js: 1392ms CPU time
Warning::
Unattributable: 866ms CPU time
Warning::
https://www.icann.org/: 808ms CPU time
Warning::
https://www.icann.org/cdn-cgi/challenge-platform/s...: 292ms CPU time
Info::
https://cdn.matomo.cloud/icann.matomo.cloud/contai...: 64ms CPU time
Warning::
Third-party scripts: 3422ms (100% of total)

Main Thread Breakdown

Script Evaluation 50% Other 19% Style & Layout 14% Parse HTML & CSS 11% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.icann.org/chunk-ROIY53Y6.js1392ms1041ms4ms3rd
Unattributable866ms347ms0ms3rd
https://www.icann.org/808ms43ms3ms3rd
https://www.icann.org/cdn-cgi/challenge-platform/scripts/jsd/main.js292ms281ms3ms3rd
https://cdn.matomo.cloud/icann.matomo.cloud/container_dcxlZGo2.js64ms49ms15ms3rd
C
Image Optimization
Action
20 images, 0 KB saveable
REVIEW
20 images, 0 KB saveable
Warning::
https://itp.cdn.icann.org/en/files/homepage/flyer-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/learn-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/engage... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/assets/images/www-static... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/tripti... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/career... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/subscr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/icann-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/kurtis... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/newcom... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/report... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/social... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/meetin... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
20 images 330 KB
0 oversized -0 KB
18 legacy format
13 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Bundles
Action
53 scripts, 162 KB unused
REVIEW
53 scripts, 162 KB unused
Warning::
https://www.icann.org/chunk-ROIY53Y6.js: 137 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.matomo.cloud/icann.matomo.cloud/contai...: 25 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 162 KB
162 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.icann.org/chunk-ROIY53Y6.js282 KB137 KB (49%)✓3rd
https://cdn.matomo.cloud/icann.matomo.cloud/container_dcxlZGo2.js52 KB25 KB (49%)✓3rd
https://cdn.cookielaw.org/consent/0191ec5b-f444-7ae1-affc-c6b451de20e4/OtAutoBlock.js0 KB—✓3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js0 KB—✓3rd
https://www.icann.org/chunk-B4IAYUVL.js0 KB—✓3rd
https://www.icann.org/chunk-WTEITCJQ.js0 KB—✓3rd
https://www.icann.org/chunk-5BBDXEKN.js0 KB—✓3rd
https://www.icann.org/chunk-6YKCXSIJ.js0 KB—✓3rd
https://www.icann.org/chunk-MT3ET2IZ.js8 KB—✓3rd
https://www.icann.org/chunk-QJAHNVIE.js0 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Page Weight Budget
985 KB transferred, 86 requests
PASS
985 KB transferred, 86 requests
Info::
Page weighs 2.9 MB (985 KB transferred)
Warning::
JavaScript is 501 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 501 KB
Info::
86 HTTP requests
Info::
Estimated 0.20 g CO2 per page load
985 KB / 2.4 MB budget
985 KB transferred
86 requests
0.20 g CO2 per page load
JavaScript 500.8 KiB 51%
Images 329.8 KiB 33%
HTML 61.2 KiB 6%
CSS 50.2 KiB 5%
Fonts 32.3 KiB 3%
Other 8.9 KiB 1%
Other 1.1 KiB 0%
Other 990 B 0%
Other 145 B 0%
0 2.4 MB 4.9 MB
Under budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
3 fonts (32 KB)
PASS
3 fonts (32 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

32 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 3.0 s LCP 7.4 shttps://itp.cdn.icann.org/assets/fonts/notosans/o-0IIpQlx3QUlC5A4PNr5TRASf6M7Q.woff2o-0IIpQlx3QUlC5A4PNr5TR... https://itp.cdn.icann.org/assets/fonts/notosans/o-0IIpQlx3QUlC5A4PNr5TRASf6M7Q.woff2 — 13.0 KiB — 63 ms — font-display: swaphttps://itp.cdn.icann.org/assets/fonts/notosans/o-0NIpQlx3QUlC5A4PNjXhFVZNyBx2pqPA.woff2o-0NIpQlx3QUlC5A4PNjXhF... https://itp.cdn.icann.org/assets/fonts/notosans/o-0NIpQlx3QUlC5A4PNjXhFVZNyBx2pqPA.woff2 — 12.9 KiB — 63 ms — font-display: swaphttps://itp.cdn.icann.org/assets/fonts/notosans/o-0IIpQlx3QUlC5A4PNr4TRASf6M7VBj.woff2o-0IIpQlx3QUlC5A4PNr4TR... https://itp.cdn.icann.org/assets/fonts/notosans/o-0IIpQlx3QUlC5A4PNr4TRASf6M7VBj.woff2 — 6.4 KiB — 357 ms — font-display: swap
o-0IIpQlx3QUlC5A4PNr5TR... woff2 swap
Size 13 KB
Load time 63 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
o-0NIpQlx3QUlC5A4PNjXhF... woff2 swap
Size 13 KB
Load time 63 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
o-0IIpQlx3QUlC5A4PNr4TR... woff2 swap
Size 6 KB
Load time 357 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
Page Weight Inventory
86 resources · 985 KB · 162 KB savings available
PASS
86 resources · 985 KB · 162 KB savings available
Info::
Within 1MB page-weight target
Got: 985 KB
Info::
~162 KB of savings available
Warning::
85 third-party resources (100% of weight)
Info::
1 resources over 200KB
86 resources · 985.5 KiB · 85 third-party Within 1MB page-weight target
JavaScript 51% · 500.8 KiB
Image 34% · 338.0 KiB
Document 6% · 61.5 KiB
CSS 5% · 50.2 KiB
Font 3% · 32.3 KiB
Other 0% · 2.6 KiB

~162.5 KiB of savings available

Remove unused JavaScript: 162.5 KiB
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A
HTTP Caching
max-age=345600 (4 days)
PASS
max-age=345600 (4 days)
Info::
Cache-Control header is set
Got: max-age=345600
Info::
Effective TTL: 4 days (max-age=345600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=345600

DirectiveValueMeaning
max-age345600Cache for 4 days
Effective TTL: 345600 seconds
Network Waterfall
86 requests over 2090ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 3.0 s LCP 7.4 shttps://icann.org// https://icann.org/ — 301 — 368 B — 293 ms — http/1.1https://www.icann.org/www.icann.org/ https://www.icann.org/ — 200 — 61.2 KiB — 640 ms — h2https://cdn.cookielaw.org/consent/0191ec5b-f444-7ae1-affc-c6b451de20e4/OtAutoBlock.jscdn.cookielaw.org/consent/0191ec5b-... https://cdn.cookielaw.org/consent/0191ec5b-f444-7ae1-affc-c6b451de20e4/OtAutoBlock.js — -1 — 0 B — 98 ms — https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 96 ms — https://www.icann.org/manifest.jsonwww.icann.org/manifest.json https://www.icann.org/manifest.json — 200 — 990 B — 479 ms — h2https://www.icann.org/styles-C4NBEBFQ.csswww.icann.org/styles-C4NBEBFQ.css https://www.icann.org/styles-C4NBEBFQ.css — 200 — 50.2 KiB — 32 ms — h2https://www.icann.org/chunk-B4IAYUVL.jswww.icann.org/chunk-B4IAYUVL.js https://www.icann.org/chunk-B4IAYUVL.js — 200 — 323 B — 30 ms — h2https://www.icann.org/chunk-WTEITCJQ.jswww.icann.org/chunk-WTEITCJQ.js https://www.icann.org/chunk-WTEITCJQ.js — 200 — 415 B — 32 ms — h2https://www.icann.org/chunk-5BBDXEKN.jswww.icann.org/chunk-5BBDXEKN.js https://www.icann.org/chunk-5BBDXEKN.js — 200 — 488 B — 36 ms — h2https://www.icann.org/chunk-6YKCXSIJ.jswww.icann.org/chunk-6YKCXSIJ.js https://www.icann.org/chunk-6YKCXSIJ.js — 200 — 492 B — 34 ms — h2https://www.icann.org/chunk-MT3ET2IZ.jswww.icann.org/chunk-MT3ET2IZ.js https://www.icann.org/chunk-MT3ET2IZ.js — 200 — 8.3 KiB — 46 ms — h2https://www.icann.org/chunk-QJAHNVIE.jswww.icann.org/chunk-QJAHNVIE.js https://www.icann.org/chunk-QJAHNVIE.js — 200 — 305 B — 51 ms — h2https://www.icann.org/chunk-KWJX5YR3.jswww.icann.org/chunk-KWJX5YR3.js https://www.icann.org/chunk-KWJX5YR3.js — 200 — 322 B — 37 ms — h2https://www.icann.org/chunk-2ZN3SE3J.jswww.icann.org/chunk-2ZN3SE3J.js https://www.icann.org/chunk-2ZN3SE3J.js — 200 — 193 B — 39 ms — h2https://www.icann.org/chunk-VSOJFYXZ.jswww.icann.org/chunk-VSOJFYXZ.js https://www.icann.org/chunk-VSOJFYXZ.js — 200 — 589 B — 51 ms — h2https://www.icann.org/chunk-WILDAPLD.jswww.icann.org/chunk-WILDAPLD.js https://www.icann.org/chunk-WILDAPLD.js — 200 — 1.0 KiB — 48 ms — h2https://itp.cdn.icann.org/en/files/government-engagement-ge/blue-tab-icon-homepage80x80government-engagement-publications-en.svgitp.cdn.icann.org/en/files/governme... https://itp.cdn.icann.org/en/files/government-engagement-ge/blue-tab-icon-homepage80x80government-engagement-publications-en.svg — 200 — 1.0 KiB — 433 ms — h2https://itp.cdn.icann.org/en/files/office-of-the-chief-technology-officer-octo-reports/blue-tab-icon-homepage80x80octo-publications-en.svgitp.cdn.icann.org/en/files/office-o... https://itp.cdn.icann.org/en/files/office-of-the-chief-technology-officer-octo-reports/blue-tab-icon-homepage80x80octo-publications-en.svg — 200 — 1.3 KiB — 428 ms — h2https://itp.cdn.icann.org/en/files/homepage/acronyms-and-terms-17-02-2023-en.svgitp.cdn.icann.org/en/files/homepage... https://itp.cdn.icann.org/en/files/homepage/acronyms-and-terms-17-02-2023-en.svg — 200 — 1.3 KiB — 430 ms — h2https://itp.cdn.icann.org/en/files/homepage/domain-name-holder-16-02-2023-en.svgitp.cdn.icann.org/en/files/homepage... https://itp.cdn.icann.org/en/files/homepage/domain-name-holder-16-02-2023-en.svg — 200 — 1.6 KiB — 434 ms — h2https://www.icann.org/polyfills-6YOLJV4E.jswww.icann.org/polyfills-6YOLJV4E.js https://www.icann.org/polyfills-6YOLJV4E.js — 200 — 12.0 KiB — 45 ms — h2https://www.icann.org/scripts-46WXS36Y.jswww.icann.org/scripts-46WXS36Y.js https://www.icann.org/scripts-46WXS36Y.js — 200 — 7.1 KiB — 42 ms — h2https://www.icann.org/main-EMMHM4DR.jswww.icann.org/main-EMMHM4DR.js https://www.icann.org/main-EMMHM4DR.js — 200 — 34.8 KiB — 55 ms — h2https://www.icann.org/src/assets/images/icons/sprites_v8.svg?v=20231127www.icann.org/src/assets/images/ico... https://www.icann.org/src/assets/images/icons/sprites_v8.svg?v=20231127 — 200 — 20.8 KiB — 43 ms — h2https://www.icann.org/src/assets/images/icons/sprites_wide.svg?v=20211212www.icann.org/src/assets/images/ico... https://www.icann.org/src/assets/images/icons/sprites_wide.svg?v=20211212 — 200 — 3.0 KiB — 39 ms — h2https://itp.cdn.icann.org/assets/images/www-static/logo/icann_logo.webpitp.cdn.icann.org/assets/images/www... https://itp.cdn.icann.org/assets/images/www-static/logo/icann_logo.webp — 200 — 13.2 KiB — 365 ms — h2https://itp.cdn.icann.org/assets/images/www-static/logo/icann-logo-tagline-en_680x152.webpitp.cdn.icann.org/assets/images/www... https://itp.cdn.icann.org/assets/images/www-static/logo/icann-logo-tagline-en_680x152.webp — 200 — 8.1 KiB — 362 ms — h2https://itp.cdn.icann.org/assets/fonts/notosans/o-0IIpQlx3QUlC5A4PNr5TRASf6M7Q.woff2itp.cdn.icann.org/assets/fonts/noto... https://itp.cdn.icann.org/assets/fonts/notosans/o-0IIpQlx3QUlC5A4PNr5TRASf6M7Q.woff2 — 200 — 13.0 KiB — 63 ms — h2https://itp.cdn.icann.org/assets/fonts/notosans/o-0NIpQlx3QUlC5A4PNjXhFVZNyBx2pqPA.woff2itp.cdn.icann.org/assets/fonts/noto... https://itp.cdn.icann.org/assets/fonts/notosans/o-0NIpQlx3QUlC5A4PNjXhFVZNyBx2pqPA.woff2 — 200 — 12.9 KiB — 63 ms — h2https://itp.cdn.icann.org/assets/fonts/notosans/o-0IIpQlx3QUlC5A4PNr4TRASf6M7VBj.woff2itp.cdn.icann.org/assets/fonts/noto... https://itp.cdn.icann.org/assets/fonts/notosans/o-0IIpQlx3QUlC5A4PNr4TRASf6M7VBj.woff2 — 200 — 6.4 KiB — 357 ms — h2
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Unused 49%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.icann.org adds 1392ms and costs ~$18/month
  • Unattributable adds 866ms and costs ~$12/month
  • www.icann.org adds 808ms and costs ~$11/month
  • www.icann.org adds 292ms and costs ~$4/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

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Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

www.icann.org takes 1392ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 866ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.icann.org takes 808ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.icann.org takes 292ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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